Hildebrand Elias C. Ligtas

Built an AI-powered document analyzer SaaS with both end-user and developer-focused workflows, enabling organizations to upload, extract, summarize, and analyze documents through an intelligent full-stack platform. Designed and implemented secure authentication, API key management, and a dedicated developer portal at docology-developers.hildebrandligtas.com for integrating document analysis capabilities into external applications and automation pipelines. Engineered scalable backend APIs, asynchronous document processing workflows, intelligent search, and cloud-ready infrastructure to support AI-driven productivity, automation, and developer platform use cases.

InvoiceData is a modern invoice generation and management platform built for freelancers, small businesses, and growing teams that need a faster, more reliable way to create, send, track, and manage invoices. The system combines a polished Next.js frontend with a structured Spring-based backend, supporting professional invoice creation, secure sharing, payment tracking, reminders, analytics, drafts, and user-specific invoice settings. Engineered with a clean layered backend architecture spanning domain, application, infrastructure, persistence, event, scheduler, and web layers to support SaaS-grade reliability, automation, and extensibility.

Engineered a production-grade real-time messaging platform delivering instant, low-latency conversations between users through a fully bidirectional WebSocket architecture. Architected an end-to-end full-stack solution combining a Next.js 16 / React 19 client, a NestJS backend, Socket.IO for real-time transport, Prisma-backed persistence, and S3-based media handling to support reliable message delivery, presence, and rich media exchange at scale. Implemented enterprise-grade authentication including credential login, OAuth sign-in, account registration, and complete password recovery flows (forgot password and secure reset), alongside AI-assisted conversational features, request rate limiting, and a polished, accessibility-conscious user interface designed for professional, everyday communication.